RAPID: A Community Test of Distributed Acoustic Sensing on the Ocean Observatories Initiative Regional Cabled Array

RAPID：海洋观测站倡议区域有线阵列分布式声学传感的社区测试

• 批准号: 2141047
• 负责人: William Wilcock
• 金额: $ 13.25万
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-09-01 至 2023-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2141047&HistoricalAwards=false
• 关键词: RAPID; Community; Test; Distributed; Acoustic

In recent years, there has been interest in the potential of offshore distributed acoustic sensing (DAS) in the Pacific Northwest and a test in this region would be of widespread interest to the oceanographic community. DAS is a relatively new observational technique in academia that interrogates an optical fiber with repeated laser pulses and utilizes changes in the phase of backscattered light to measure the strain rate along the fiber. DAS can work to distances of up to ~100 km, has a spatial resolution of a few meters and a broad frequency sensitivity. There is still a lot to be learned about how the DAS signal responds to strain. On land, DAS has been demonstrated for a wide variety of applications including earthquake monitoring and rapid response aftershock studies etc. DAS experiments in the ocean are more challenging. It wasn’t until 2019 that the potential of seafloor DAS for academic research was demonstrated. The Oregon margin is one of the most energetic coastlines in the world and an excellent location to test the DAS capabilities and is thus, an ideal site to study the role of storms in generating seismic noise near coastlines and potentially understanding if and how DAS could be used for measuring sediment exchange. DAS has also been identified as a new technology that might form an important component of future offshore earthquake and tsunami early warning systems in Cascadia and elsewhere. The scheduled shutdown provides a great opportunity to test DAS in this region. A Caltech graduate student will get experience leading data acquisition and two UW graduate students will gain experience in DAS/DTS data acquisition. The PIs are taking advantage of a rare scheduled shutdown in early November 2021 of the Ocean Observatories Initiative (OOI) Regional Cabled Array (RCA). With the RCA cables disconnected from all RCA shoreside equipment, the distributed acoustic sensing (DAS) and distributed temperature sensing (DTS) systems will be connected to the OOI fibers and will undergo testing to determine the potential of submarine DAS to observe seismic, oceanographic, acoustic and geodetic processes. DAS is potentially of great importance for efforts to develop offshore earthquake and tsunami warning systems in Cascadia and this experiment represents an important step in developing protocols that can support the use of DAS for science and hazards mitigation in the Northeast Pacific while meeting national security requirements.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

近年来，人们对太平洋西北部近海分布式声学传感（DAS）的潜力感兴趣，在该地区进行测试将引起海洋学界的广泛兴趣。DAS在学术界是一种相对较新的观测技术，它用重复的激光脉冲询问光纤，并利用反向散射光的相位变化来测量沿着光纤的应变率。DAS的工作距离可达约100公里，空间分辨率为数米，频率灵敏度较宽。关于DAS信号如何响应应变，还有很多东西需要了解。在陆地上，DAS已被证明用于各种各样的应用，包括地震监测和快速响应余震研究等。海洋中的DAS实验更具挑战性。直到2019年，海底DAS用于学术研究的潜力才得到证实。俄勒冈州边缘是世界上最具活力的海岸线之一，也是测试DAS能力的绝佳地点，因此，是研究风暴在海岸线附近产生地震噪声方面的作用的理想场所，并可能了解DAS是否以及如何用于测量沉积物交换。DAS也被确定为一种新技术，可能成为卡斯卡迪亚和其他地方未来近海地震和海啸预警系统的重要组成部分。计划关闭为在该地区测试DAS提供了一个很好的机会。一名加州理工学院的研究生将获得领导数据采集的经验，两名华盛顿大学的研究生将获得DAS/DAS数据采集的经验。PI正在利用2021年11月初海洋观测站计划（OOI）区域电缆阵列（RCA）的罕见计划关闭。随着RCA电缆与所有RCA岸上设备断开，分布式声学传感（DAS）和分布式温度传感（DAS）系统将连接到OOI光纤，并将进行测试，以确定海底DAS观察地震，海洋学，声学和大地测量过程的潜力。DAS对于在卡斯卡迪亚开发近海地震和海啸预警系统的努力具有潜在的重要性，该实验代表了开发协议的重要一步，该协议可以支持在东北太平洋使用DAS进行科学和减灾，同时满足国家安全要求。该奖项反映了NSF的法定使命，并被认为值得通过使用基金会的知识产权进行评估来支持。优点和更广泛的影响审查标准。

项目成果

Distributed acoustic sensing recordings of low-frequency whale calls and ship noise offshore Central Oregon

俄勒冈州中部近海低频鲸鱼叫声和船舶噪音的分布式声学传感记录

• DOI: 10.1121/10.0017104
• 发表时间: 2023
• 期刊: JASA Express Letters
• 影响因子: 1
• 作者: Wilcock, William S.;Abadi, Shima;Lipovsky, Bradley P.
• 通讯作者: Lipovsky, Bradley P.